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chromium/third_party/blink/web_tests/external/wpt/css/css-flexbox/negative-overflow.html 

<!DOCTYPE html>
<html>
<head>
<title>CSS Flexbox: align-items: center/flex-end and bottom padding.</title>
<link rel="stylesheet" href="support/flexbox.css" >
<link rel="help" href="https://drafts.csswg.org/css-flexbox/#align-items-property">
<meta name="assert" content="This test ensures that flexbox containers with 'align-items: center|flex-end' and 'overflow: auto/scroll' have no extra bottom padding."/>
<style>
.flexbox {
    overflow: auto;
    height: 50px;
    width: 50px;
    background-color: red;
    position: relative;
}

.vertical-padding {
    padding-top: 5px;
    padding-bottom: 10px;
    background-color: lime;
}

.vertical-border {
    border-top: 2px solid black;
    border-bottom: 8px solid lightblue;
}

.flexbox > div {
    width: 100%;
    height: 100px;
    background-color: green;
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<script>
window.onload = function() {
    checkLayout('.flexbox');

    // Make failures more obvious by showing the red background that should have been clipped.
    Array.prototype.forEach.call(document.querySelectorAll(".flexbox"), function(element) {
        element.scrollTop = 1000;
    });
};
</script>
</head>
<body>
<div id=log></div>

<div class="flexbox align-items-flex-end" data-expected-scroll-height="50">
    <div></div>
</div>

<div class="flexbox align-items-flex-end" data-expected-scroll-height="150">
    <div></div>
    <div style="position: absolute; left: 0; top: 50px;"></div>
</div>

<div class="flexbox align-items-center" data-expected-scroll-height="75">
    <div></div>
</div>

<div class="flexbox" data-expected-scroll-height="100">
    <div></div>
</div>

<div class="flexbox wrap-reverse" data-expected-scroll-height="200">
    <div></div>
    <div></div>
</div>

<div class="flexbox align-items-flex-end vertical-padding" data-expected-scroll-height="65">
    <div></div>
</div>

<div class="flexbox align-items-flex-end vertical-padding vertical-border" data-expected-scroll-height="65">
    <div></div>
</div>

<div class="flexbox align-items-center vertical-padding" data-expected-scroll-height="90">
    <div></div>
</div>

<div class="flexbox vertical-padding" data-expected-scroll-height="115">
    <div></div>
</div>

<div class="flexbox vertical-padding vertical-border" data-expected-scroll-height="115">
    <div></div>
</div>

<div class="flexbox wrap-reverse vertical-padding" data-expected-scroll-height="215">
    <div></div>
    <div></div>
</div>
</body>
</html>